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3 years ago

Calculate the Kinetic energy of an object with a mass of 15kg while sitting on a shelf that is 20m high.

1 answer:

6 0

Kinetic energy is energy of motion. If the object is sitting still, then it has no kinetic energy. It doesn't matter what its mass is, or how high the shelf is.

KE = 0

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3 years ago

A crate of mass 50kg is pushed along a floor with a force of 20N for a distance of

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Answer:

F=50kg

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3 years ago

Which of the following is a difference between sound and light?

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Answer:

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3 years ago

Read 2 more answers

A horizontal force of 40N is needed to pull a 60kg box across the horizontal floor at which coefficient of friction between floo

Mazyrski [523]

Answer:

Coefficient of friction is $0.068$ .

Work done is $320~J$ .

Explanation:

Given:

Mass of the box ( $m$ ): $60$ kg

Force needed ( $F$ ): $40$ N

The formula to calculate the coefficient of friction between the floor and the box is given by

$F=\mu mg...................(1)$

Here, $\mu$ is the coefficient of friction and $g$ is the acceleration due to gravity.

Substitute $40$ N for $F$ , $60$ kg for $m$ and $9.80$ m/s² for $g$ into equation (1) and solve to calculate the value of the coefficient of friction.